amplitude frequency response characteristics

例句：

1. 1. The amplitude of the wave is measured in units of length.
   波的振幅是以长度单位测量的。
2. 2. The frequency response characteristics of the system are important for optimizing itsperformance.
   系统的频率响应特性对于优化其性能至关重要。
3. 3. The amplitude of the signal can vary greatly depending on the source and receiver conditions.
   信号的振幅可以根据源和接收器的条件有很大的变化。